$\frac{a^4-a^2-1}{a^2+1}$

$2\left(a+4\right)^2+3y$

$\frac{3}{4}^{\left(-2\right)\left(3\right)}4^3\:-\left(-2\right)^2\:\left(3\right)^3\left(4\right)^2+\:\left(-2\right)^3\:\left(3\right)^2\:4^3-\frac{1}{2}$

$\frac{dy}{dx}=\frac{3x}{y}+\frac{8}{y}$

$\left(x^2-5.65x+8\right)^2$

$\int\left(\frac{7}{x^8}\right)dx$

$\sqrt{2^2-x^4}$